Set the image to display by providing a URL to the <Path> element.
The URL can be any of the following:
An example similar to the functionality you describe (selecting an image from the file system and displaying it) is provided in the File Library demo of the Examples application.
Screen placement is controlled by use of display containers such as Panes, Grids, Tables, Rows, etc. making use of the underlying HTML rendering of each browser. In other word, each display element is translated to an HTML tag (or in some cases tags), and placement is ultimately derived from the way the browser renders the HTML.
For best results, use the Firefox browser..